Answer / n.k.singh

if we are designing any system we must know reliability and
stability of the system and purpose of the system.without
any goal or aim how to design any system, there should be
some idea behind the system, acordingly design is made

Answer / john h

Answe #1 is right. you need to know your system will work
and under what conditions and design for them. as
Conditions change so may your system reliability.

For instance AWG can handle a specified current at a given
size but under some conditions this value may need to be
derated. same goes for many components. Nema can often take
more abuse then IFE ( a european standard i can't recall
the name accuratly) as these components are made with less
resources and operate in tighter tolerances. Often but not
always cheaper then NEMA for the same ratings.

This also gets into dirty electrical waveforms and magnetic
flux you do not want a near by conduit accidently inducing
a voltage on a signal line triggering a false or true
conditions. this can bring about changes in your control
system causing erratic behaviour

what happens when back feeding supply accidently collapses with normal supply ??? How?? [that is sometimes in a substation 11kv feeder if their ws long time permit work, back feeding supply will provide from nearest substation... if accidently after the permit work,they charged the feeder without removing back feeding wat will happen...?]

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